adapter-aad-pod-identity.yaml

---
apiVersion: v1
kind: Namespace
metadata:
  name: custom-metrics
---
kind: ServiceAccount
apiVersion: v1
metadata:
  name: custom-metrics-azure-apiserver
  namespace: custom-metrics
---
# allow custom metrics server to authenticate/auth
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: custom-metrics:system:auth-delegator
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: system:auth-delegator
subjects:
- kind: ServiceAccount
  name: custom-metrics-azure-apiserver
  namespace: custom-metrics
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: custom-metrics-auth-reader
  namespace: kube-system
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: extension-apiserver-authentication-reader
subjects:
- kind: ServiceAccount
  name: custom-metrics-azure-apiserver
  namespace: custom-metrics
---
# deployment
---
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: custom-metrics-azure-apiserver
    aadpodidbinding: custom-metrics-identity
  name: custom-metrics-azure-apiserver
  namespace: custom-metrics
spec:
  replicas: 1
  selector:
    matchLabels:
      app: custom-metrics-azure-apiserver
  template:
    metadata:
      labels:
        app: custom-metrics-azure-apiserver
        aadpodidbinding: custom-metrics-identity
      name: custom-metrics-azure-apiserver
    spec:
      serviceAccountName: custom-metrics-azure-apiserver
      containers:
      - name: custom-metrics-azure-apiserver
        image: jcorioland/azure-k8s-metrics-adapter:latest
        args:
        - /adapter
        - --secure-port=6443
        - --logtostderr=true
        - --v=2
        ports:
        - containerPort: 6443
        volumeMounts:
        - mountPath: /tmp
          name: temp-vol
        env:
          - name: APP_INSIGHTS_APP_ID
            valueFrom:
                secretKeyRef:
                  name: app-insights-api
                  key: app-insights-app-id
      volumes:
      - name: temp-vol
        emptyDir: {}
---
apiVersion: v1
kind: Service
metadata:
  name: custom-metrics-azure-apiserver
  namespace: custom-metrics
spec:
  ports:
  - port: 443
    targetPort: 6443
  selector:
    app: custom-metrics-azure-apiserver
---
# register custom metrics api
---
apiVersion: apiregistration.k8s.io/v1beta1
kind: APIService
metadata:
  name: v1beta1.custom.metrics.k8s.io
spec:
  service:
    name: custom-metrics-azure-apiserver
    namespace: custom-metrics
  group: custom.metrics.k8s.io
  version: v1beta1
  insecureSkipTLSVerify: true
  groupPriorityMinimum: 100
  versionPriority: 100
---
# give custom metrics service access specific resources
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: custom-metrics-resource-reader
rules:
- apiGroups:
  - ""
  resources:
  - namespaces
  - pods
  - services
  verbs:
  - get
  - list
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: custom-metrics-resource-reader
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: custom-metrics-resource-reader
subjects:
- kind: ServiceAccount
  name: custom-metrics-azure-apiserver
  namespace: custom-metrics
---
# give HPA access to custom metrics
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: custom-metrics-server-resources
rules:
- apiGroups:
  - custom.metrics.k8s.io
  resources: ["*"]
  verbs: ["get", "list"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: hpa-controller-custom-metrics
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: custom-metrics-server-resources
subjects:
- kind: ServiceAccount
  name: horizontal-pod-autoscaler
  namespace: kube-system
---
# register external metrics api
---
apiVersion: apiregistration.k8s.io/v1beta1
kind: APIService
metadata:
  name: v1beta1.external.metrics.k8s.io
spec:
  service:
    name: custom-metrics-azure-apiserver
    namespace: custom-metrics
  group: external.metrics.k8s.io
  version: v1beta1
  insecureSkipTLSVerify: true
  groupPriorityMinimum: 100
  versionPriority: 100
---
# give HPA access to external metrics
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: external-metrics-reader
rules:
- apiGroups:
  - "external.metrics.k8s.io"
  resources:
  - "*"
  verbs:
  - list
  - get
  - watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: external-metrics-reader
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: external-metrics-reader
subjects:
- kind: ServiceAccount
  name: horizontal-pod-autoscaler
  namespace: kube-system